User manual

Measurements
R&S
®
RTO
148User Manual 1316.0827.02 ─ 06
7. To define high and low signal levels:
a) Enter the absolute high and low signal levels.
b) By default, the lower reference level is defined at 10% of the selected signal level,
the middle reference level at 50% and the upper reference level at 90%. Option-
ally, select other "Relative levels", or define absolute "Top distance" and "Bottom
distance" values to be used for evaluation.
8. To define lower, middle and upper reference levels:
a) Enter the absolute upper and lower reference levels.
b) By default, the lower reference level is defined at 10% of the selected signal level,
the middle reference level at 50% and the upper reference level at 90%. Option-
ally, select other "Relative levels", or define absolute "Top distance" and "Bottom
distance" values to be used for evaluation of the high and low signal levels.
9. To define a hysteresis for the middle reference level, select the "Hysteresis" tab and
enter a percentage of the selected signal level.
A rise or fall from the middle reference value that does not exceed the hysteresis is
rejected and not considered a zero-crossing.
10. To define a tube for the high and low signal levels:
a) Select the "Tube" tab.
b) For relative value definition:
In the "Relative outer" field, define a percentage of the signal level by which the
absolute signal level may be larger than the high signal level or lower than the
low signal level to be considered high or low, respectively.
In the "Relative inner" field, define a percentage of the signal level by which the
absolute signal level may be higher than the low signal level or lower than the
high signal level to be considered low or high, respectively.
c) For absolute value definition:
In the "Top outer" field, define an area above the high signal level which is still
considered to be high level.
In the "Top inner" field, define an area beneath the high signal level which is still
considered to be high level.
In the "Bottom inner" field, define an area above the low signal level which is still
considered to be low level.
In the "Bottom outer" field, define an area beneath the low signal level which is
still considered to be low level.
To display reference levels and intermediate results
1. From the "Meas" menu, select "Setup" to open the "Measurement" dialog box.
2. Select the tab for the measurement you want to configure.
3. Select the "Gate/Display" tab.
Automatic Measurements